X-Ray equipment in which the focal spot size is less than 100 µm is referred to as microfocus unit. Advanced micro-focus units have a focal spot size as low as 5 µm which is achieved by focussing the electron beam on the target. Micro-focus radiography facilitates to observe the minute details of the object through production of magnified X-ray image, which in turn enhances the flaw detection capability with improves reliability in comparison to conventional radiography. Micro-focus X-ray systems having focal spots that approach a point source are useful in obtaining very high resolution images. A spatial resolution of 0.002 in. using real-time radiography is achievable with advanced micro-focus X-ray sources.
The X-ray source generates a continuous beam of X-rays from a 5µm spot. The beam passes through the sample placed on the manipulator turntable, and casts an X-ray shadow onto the intensifier window. The intensifier converts the X-ray shadow into a visible image, which is recorded by a digital video camera and displayed on a monitor. The magnification of the sample depends on its position between the X-ray source and intensifier. Moving the sample towards the X-ray source enlarges the X-ray shadow, showing greater detail. Even when operating at maximum magnification, the ultra-fine X-ray spot ensures the monitor image is always sharp. The associated software enables contrast enhancement and image integration.
TWI Resources
X-Tek HMX225 micro-focus advanced X-ray system
Features:
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5 µm Focal Spot Reflection Target X-ray Source
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25 - 160 kV or 25 to 225 kV, 0 - 2000 µA (non- continuous) 60 or 225 Watt
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5 axis fully programmable manipulator
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Maximum scan area 480 x 510mm (480 x 680mm in 2 scans)
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Geometric Magnification up to: 160x
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System Magnification up to: 400x
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Feature recognition: down to 1µm
Benefits
Applications
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Inspection of Integrated Circuits and PCB’s
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Inspection of high quality castings and weld material
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Tube to tube sheet weld Inspection
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Inspection of composites and ceramics for micro-voids and structural inhomoginity
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Inspection of inaccessible areas
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Inspection of turbine blades of aero engine to detect hair line cracks
Related links
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